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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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The mechanical tappets changed in late 1957/1958. Earlier mechanical tappets should not be used in the later engines. Maybe Pre '68 Dave will know if the earlier hydraulic tappet design is OK in the later block. The later mechanical tappet design in the earlier block might allow easier oil flow around the tappets.
Still no answer/explanation.
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